Reorganize python testing folder into a unit and integration folder and begin to increase coverage by file

[anth-volk]

I'm not yet sure how we should treat the current breakdown we have into python and api tests, as the python tests use standard Pytest, while the api tests are built against a YAML parsing structure just to test endpoint liveness and more basic request types - perhaps we even just keep the two separate. Even so, we should do something to break python down into unit, for file-level unit testing, and integration, for cross-API integration testing that doesn't need to correspond with our file structure. This should help increase coverage, as it will be easy to determine what is and isn't tested.